Microsoft is tired of Google’s campaign to paint it as a patent troll, and it has come up with some fairly simple suggestions to stop the bad blood: quit the negative publicity, and agree to our terms (or else).

After proving it can still innovate in the smartphone arena with the Lumia 900, Nokia is now getting aggressive about defending its patents. The company announced this morning that it has filed patent suits against HTC, Research in Motion, and Viewsonic in the U.S. and Germany.

David Sacks, the CEO of Yammer, is pissed. Last month he was hit with his first lawsuit from a patent troll. So when he saw that Yahoo was going after Facebook for patent infringement, he drew a line in the sand (well, on Twitter to be precise): “I’m declaring it: Yammer will never hire another former Yahoo employee who doesn’t leave in the next 60 days. Who will join me? #stopyahoo”

Yahoo has put the IP squeeze on Facebook, slapping it with a patent lawsuit during the quiet period in the run up to the social network’s IPO. While it’s tempting to see this as the first shot fired in a broader patent war centered around social networking, Lance Lieberman, a veteran New York patent lawyer with a specialty in software, thinks it’s just Yahoo’s first step down the dark path towards life as a patent troll.

With Facebook getting ready for its IPO, Yahoo has decided to sue over patent infringement. Yahoo used the same tactic against Google in the run up to their IPO, pocketing a helping of the search engine’s pre-IPO shares.

Google’s announcement this morning that it’s acquiring Motorola may have come as a surprise, but it certainly makes a lot of sense: Google has been wanting to get its hands on a stash of mobile patents for months, and it’s finally got them with Motorola.